From: Stephen Alrich Marshall <[email protected]> To: [email protected] Date: 06/19/09 02:06 pm ASA et al, The FCC legal range is around 200 feet
> http://www.wholehousefmtransmitter.com/?gclid=CJ37rKjxlpsCFURM5QodHVEqqg and there is a simple FM stereo kit on this page > http://www.dckits.com/stcast.htm for about $30 that I plan to build. I get the idea that a transmitter cannot be placed very close to a receiver - duh. But still, I would like to build it onto a sound card for direct connections. No more running wires that have a knack for breaking. Any body have a knack for hardware? I'd like to run the transmitter from computer power. Stephen Marshall On Friday 19 June 2009, [email protected] wrote: > First off, I should say that I know very little about this hardware stuff, > so I'm sure others will correct me. Having a receiver and transmitter on the > same card would be challenging to engineer: when a transmitter is close to a > receiver, there's leakage. Even if the TX/RX frequencies are far apart, it's > still possible for interference, depending on harmonics and stuff that I > don't understand well enough to explain. Of course, it may not be necessary > to support simultaneous RX and TX, but it's worth considering. > > And of course, there's a reason the available consumer FM transmitters are > so weak - FCC rules. Even many of those weak FM transmitters used in cars > are even running in at illegal power levels - NPR has been lobbying to get > the FCC to enforce those rules more. Legally, these things are only supposed > to have a max range of something like 12 feet. Not that it would really harm > anyone to build a transmitter that is little more powerful, but it's worth > noting. > > For receivers, there are a lot of PCI FM receivers out there. AudioScience > even makes one with 4 HD receivers, or 8 standard FM tuners, and they have > open source Linux drivers. But, they cost more than most computers these > days - they're really aimed at radio stations monitoring multiple > transmitters, not consumers. > > It's a great idea though. Right now, my little home server computer plays my > music collection using MPD, using the built audio card, and Icecast. I've > been trying to figure out how to get audio to other places in my apartment. > I don't really want to invest in stream receiver radios/computers, and I > don't want to run audio cable since I don't own the place . . . an FM > transmitter might be a nice solution. > > Asa > > On Fri, Jun 19, 2009 at 10:38 AM, Rion D'Luz <[email protected]> wrote: > > > Hail Vaguers: > > > > An acquaintance forwarded me this email with the hope that this list > > might provide a tip or pointer. > > Me, I'm clueless. > > > > Rion
signature.asc
Description: This is a digitally signed message part.
